No, there in lies the problem as I think it's an integral part of the complete door card and therefore only replaceable by getting the whole door card I have looked on Rimmer bros and can't see the part shown at all.
I can always resort to glueing them back in.

In a related case where the plastic nutsert of this : Bracket-front door pull - EJF10010 stripped, the nutsert wasn't shown as a spare in the XW part hierarchy, and I had to buy the complete bracket. Then I stumbled across the insert as DRC5582 listed as spare for several other Rover/MG/Land-Rover models, and incidentally much cheaper in semi-bulk on eBay!